I've worked in a company and we tried many wikis and partially build some ourself e.g. we used a wiki in SharePoint 2013/2016 and added features that were missing like tagging and internationalization that actually works and it was still crap. I have to say this is the best wiki/documentation software I've ever seen! So clean and minimal yet so many good features and nothing more and everything for free. Thank you very much you're awesome !!
There is not font-size control in the editor itself. You could override the font size for all content paragraph blocks globally by using the "Custom HTML Head Content" setting with content along the lines of : .page-content p { font-size: 20px; }
